Theatrical appliance



Aug. 6, 1929. HEUSS 1,723,168

: THEATRICAL APPLIANCE Filed July 18, 1927 INVENTOR Ira/121M085. QmZTHM-QM ATTOR N EYS.

Patented Aug. 6, 1929.

UNITED STATES PATENT, OFFICE.

IRWIN HZBUBB, NEW YORK, 11'. Y.

' THEMED-A!- APPLIANCE- Application am July 1.8,

to provide, what I term, an aeroplane buzzer, to 0 rate on alternating current c1r-' cuits of om 40 to 200 voltspotential.

Further, it is an ob'ect of-my invention to provide an electri y operated a paratus using radio tubes, transformers, an circuit arrangements, which eliminates the necess ty for batteries either for filament energizatlon or late and grid voltages.

er, it is an object of said invention to provide a means. utilizing: loud speaker or loud speakers to distri ate the sound where most effective for the purpose of my inventio and to'provide a simple rheostat control 0 filament current to vary the mtensit of the sound plroduced.

ther objects wi in art be obvious and in art be pointed out ereinafter.

o the attainment of the aforesaid objects and ends, my invention consists in the novel details of construction and in the combination, connection and arrangement of parts hereinafter more fully described and then pointed out in the claims.

In the accompanying drawing the figure is a diatic view illustrating my invention.

In the drawing in which like numerals of reference indicate like arts in all the figures, 1 represents the eed of an ordina alternating current circuit such as is usua y found in the equipment of theatres. Connection to the wires 1 ma be made throu h the usual socket and p ug connections not shown in the drawing): C nnected across the terminals of the circuit 1 is a step-down transformer 8 dedgned to reduce the output vol e to six volts, and in at least one of the cod wires 1 there is placed a cutout switch 2.

The step-down transformer 3 has its primary coil 4 in circuit with the wires 1 and its seconda coil 5 in circuit with the filaments of t e several radio tubesand the controlli rheostat therefor.

One a d of each of the coils 4 and 5 is connected together as indicated at 6;

From the connected end ofthe coil 5 a wire 7 leads to a rheostat 8, and from the other end of the coil 5 a wire 14 leads to 1927. Serial I0. 206,730.

one end of each of the filaments 12 of the res ective radio tubes 9, 10 and 11, the other en s of each of the filaments connect by wire 13 to the rheostat 8.

' 15 and 18 indicate audio transformers, the primary coil 16 of the transformer 15 being radio tube 9 and also bein connected as at 25, to the wire 27 which as one end connected to the circuit wire 1 between the switch'2 and the coil 4, and which has its c0nnected, as at 22, with the plate 21 of the other end connected to the terminal 29 to which one of the terminals of the. loud speaker 30 is connected.

The transformer 18 has its primary coil 19 connected at 23 with the plate 21' of the radio tube 10 and also at 26 wlth the wire 27.

The plate 21 of the radio tube 11 is connected at 24' to the terminal 28 to which the loud speaker is also connected;

. The secondary coil 17 of the transformer '15 is connected at 32 with the grid 31 of the radio tube 10 and at 34 with the wire 13.

Likewise the secondary coil 20 of the trans former 18 is connected at 33 to the grid 31 of the radio tube 11 and at 35 to the wire 13..

The grid 31 of the first tube 9 is not used, said tube 9 constituting in effect a two electrode rectifier or detector.

In operation, current flowing through the circuit 1 at relatively high voltage, upon a ow closing the switch 2, will produce voltage current in the secondary coil 5 and cause the filament circuit to heat up the several filaments 12. From the first tube 9 on, the circuits are similar to the ordinary ampli ing circuits. Assume that the current 1n t e circuit 1 is of sixty cycles, the potential of the plates alternates sixty times positive and negative. Every time the plate potential becomes positive (in this illustration thirty times per second) the tubes start to work. The electrons passing in the usual way between filament and plate results in an impulse of current in the first tube 9 which is in turn amplified through tubes 10 and 11 and transmitted to the loud speaker 30.- It should be understood that as many loud s eakers 30 maybe employed as desired, and t ey may be located at different places in the auditorium asfo'und desirable so as to carry the sound to all points in the auditorlum.

, tubes bein sufficient skill in the manipulation of the rheostat to simulate the sound of a flying aeroplane approaching and retreating as ma be desired.

fiaving thus described my said mventlon, what I claim and desire to secure by Letters Patent is:

1. In theatrical appliances for producing sound, the combination with a high voltage alternating current circuit, a step-down transformer whose primary coil is located in said circuit, of a detector tube, amplifying tubes, audio transformers and a loud speaker, the filaments of said tubes being connected in circuit with the secondary coil of said step-down transformer, and means for energizing the plate circuits from the alternating current circuit plate and grid circuits, the secondaries of said audio transformers being connected in the grid circuits and said loud speaker being connected in the plate circuit of the last tube, the primaries of the audio transformers being connected in the plate circuits of the preceding tubes.

2. In theatrical appliances for producing sound, the combination with a high voltage alternating current circuit, a step-down transformer whose primary coil is located in said circuit, of a detector tube, amplifying tubes, audio transformers and a loud speak-v er, the filaments of said tubes being connected in circuit with the secondar coil of said step-down transformer, the p ates of said tubes being connected with one of the wires.

of said alternating current circuit, the plate of the last tube also being connected in circuit with said loud speaker.

3. In theatrical appliances forproducing sound, the combination with an alternating current circuit, a step-down transformer whose primary coil is located in the said circuit, a detector tube whose filament is connected in circuit with the secondarycoil of said transformer, audio amplifying circuits including radio tubes and amplifylng audio transformers, the filament circuits of all said amplifying tubes including the secondary coil of said step-down transformer, a rheostat in circuit with said secondary coil of said step-down transformer for controllin the filament current, the plate circuits of sai connected to one side of the primary coil of said step-down transformer,

the other side of said 1tprlmary coil being connected to one side 0 the secondary coil of said step-down transformer, and a loud. speaker unit connected in the plate circuit of t e last tube.

4. In theatrical appliances for roducing sound, the combination with an alternating current circuit, a step-down transformer whose primary coil is located in the said circuit, a detector tube whose filament is connected in circuit with the secondary coil of said transformer, audio amplifying circuits includng radio tubes and amplifying audio transformers, the filament circuits 0 all said amplifying tubes including the secondary coil of said step-down transformer, a rheostat in circuit with said secondary coil of said step-down transformer for controlling the filament current, theplate circuits of said.

former whose primary coil is in said circuit,

a radio tube whose filament is connected in circuit with the secondary coil of said -stepdown transformer, a controlled rheostat in the filament circuit a connection between the plate of said tube and one side of said alternating current circuit, a connection between the other side. of said alternating current circuit and said secondary coil, and means for rendering audible the waves generated in the late circuit of said tube.

6. A. theatrical appliance for producing sound simulating that of an aeroplane in flight, which appliance comprises in combination with an alternating current circuit of relatively high voltage, a step-down transformer whose primary coil is in said circuit, a radio tube whose filament is connected in circuit with the secondary coil of said ste -down transformer, a controlled rheostat 1n the filament circuit, a connection between the plate of said tube and one side of said alternating current circuit, a connection between the other side of said alternating current circuit and said secondary coil, and means for amplifying and generated in alternating current circuit, a connection be-' tween the other side of said alternating current circuit and said secondary coil, means for rendering audible the waves generated in the plate circuit of said tube, said means comprising amplifying circuits including auof the connections between the filaments of dio transformers and amplifying tubes, the said amplifying tubes and the secondary coil filaments of which tubes are connected in of said step-down transformer, and a loud circuit with the secondary coil of said stepspeaker in circuit with the last tubes plate.

5 down transformer and with said rheostat, Signed at the city of New York, borough 15 and the plates of said amplifying tubes beof Manhattan, in the county and State of ing connected to one side of said alternating New York, this eleventh day of July, one current circuit, and the grids of said amplithousand nine hundred and twenty-seven. fying tubes being connected via the second- 10 ary coils of said audio transformers with one ERWIN HEUSS. 

